Anchor for drilling mechanism



Dec. 2, 1930. G. w. HULSHIZER 1,733,290

ANCHOR FOR DRILLING MECHANISM Filed Feb. 19, 1929 2 Sheets-Sheet 1 INVEN TOR.

HIS ATToRNB? Dec. 2, 19304 G. w. HULSHIZER 1,733,290

ANCHOR FOR DRILLING MECHANISM Filed Feb. 19, 1929 2 Sheets-Sheet 2INVENTOR.

aisizg er Hi5 ATTORNEY Patented Dec. 2, 1930 UNITED STATES PATENT OFFICEGEORGE w. HULSI-IIZER, or srEwAa'rsvILLE, nnwannsnmnss enon 'roINGERSOLL- BAND CQMPANY, or JERSEY CITY, NEW JERSEY, A CORPORATION onNEW JERSEY r ANC HOR FORDRILLING- MECHANISM V Application filed February19, 19 29. Serial No. 341,193.

of the working implement preparatory to the delivery of the blows of thehammer piston.

The rock drill may be provided with a suitablehandle against whichmanual pressure may be applied to. resist the tendency of the drill tofollowthe movement of'the rotation mechanism. Normally, under favorableconditions, a slight pressure may sufiice tohold the drillagainst rotarymovement. Under Where soft strata are encountered bythe drill steel, thedrill steel advances very-rapidly, so

that instead of forming a drill hole of generally cylindrical shape,t-he wings of the drill bit will rifle the material being drilled,"

When employing drillsequipped withfauto matic rotation mechanism all ofthe elements through which rotation is transmitted toiand.

7 including the drill steel. are of course interlocked with, each otherand, sincethe thrust for rotating these elements reacts against thestationary elements of the drill, it will readily be seen that when thehole becomesrified the entire drilling mechanismtendsto rotatewith I thedrill steel.

When this occurs. a heavy thrust is impartedj'to the portion againstwhich the operator applies pressure, such as the handle, and it happensnot infrequently that the handle is jarred out of the operators grasp. PThe drill is then of coursefree to rotate about its axis and unless theoperator has i suiiicient room, to quickly remove himself from the rangeo'f the'rapidly rotating-banthe will of the operator.

dle, he may sufifer serious injury.

take placein 'the drill hole the drilliiigmech anism will notrotateabolit its axis unless by Another object to enable anchoringmeansto be readilyrocked out of thean'cl oring position mm a releasedpositionarid tobe' retained inthe latter position in a simplified manneruntil conditions in the drill hole are The present invention-,contem'plates'the elimination of chances ofin1uryjto the operator byso anchoring or securing the drilling In the drawings illustrating theinvention. and. inwh ch similar reference characters refer to similarparts,

' Figure 1 is a elevation partly in section of a stoper type rock drillhaving theiiivention applied thereto,

Figure .Z is a sectional enlarged elevation illustrating in deta l themanner in which the other conditions, however, and particularly anchorissecured to the feed rod and showing the anchor in engagement with anabutment, Figure 3 is a view taken through Figure 2 on. the line 33looking in the direction, in dicated by the arrows,

Figure 4 is a view similar to Figure 2 showing: the anchor in thereleased position,

againsuch that the anchor may be placed in V Figure 5 is an elevationpartly in section I of a modification of the invention, and

Figure, 6 s a transverse View taken trough Figure 5' on the line 6+6looking in the direction indicated by the arrows.

, Referring to the drawings, A designates generally a rockdrill of thestopertype comprising a percussive element B and a feediiigelement G.The percussive element shown in'outline comprises a cylinder D to p thefrontend of which'is secured a front" head E and to the rearward end aheadblock F. A drill steel G extends iiitothe front head E wherein it'isguided and interlocked with a chuck H, only a portion of Which is shownprotruding from the end of the iront head E.. r

The rock drill illustrated is intended to represent one of the'type inwhich automatic rotation mechanism is provided ior1i1npart ing rotarymovement-to the drill steel G. The

rotation mechanism is not shown, but it is able type capable ofimpartinga step step rotary movement to the drill steel preparertory to thedelivery ofthe blows ofthe' hammer piston (not shown) I The admissionofpressure fiiiid-to tlie drill to be understood-that it may be of anysuited by a lever J adjacent the head block F. Secured to the head blockF is a handle K which may be grasped by the operator for manuallyrotating the drilling mechanism.

The feeding mechanism C comprises the usual cylinder L which may besecured to the head block F by any suitable means, such as bolts 0,which as illustrated, may also clamp the feeding cylinder L and thepercussive cylinder D together.

lVithin the feeding cylinder L is disposed a feeding piston P carrying afeed rod Q illustrated in this instance as being of rectangular crosssection. The rod Q extends through a rectangular aperture R in a head 55forming a closure for the lowermost end of the feed cylinder L. In theprojecting or lowermost end of the feed rod Q is a pointer T adapted toengage an abutment, such as a mine floor, or as illustrated, a plank Uwhich may be disposed on the mine floor and which the pointer T maypenetrate to prevent the drilling mechanism from moving out of theoperative position.

From the foregoing it will readily be observed that there cannot be anyrelative rotation between the feeding element and the easing parts ofthe percussive element. In other words, even though the resistance tothe rotation handle K were removed to permit the drilling mechanism torotate with the drill steel the feed rod would also rotate with thefeeding cylinder.

In accordance with the present invention additional means, other thanthe handle K,

are provided for insuring against unauthor- 1 ized rotation of thedrilling mechanism. To

this end the feed rod Q is provided near its lowermost end with atransverse slot V which opens in this instance in opposite sides of thefeed rod, thus leaving walls N and X on opposite sides of the slot V.Apertures Y and Z are formed in the walls W and X respectively for thereception of a pivot pin I) which extends through the slot V and in thisinstance has a threaded end 0 carrying a nut (Z for drawing the pivotpin Z) firmly into the apertures Y and Z.

The pivot pin 6 in most respects resembles a bolt and has fiat opposedsurfaces 6 and f which preferably extend along the entire unthreadedportion of the pivot pin. On one end of the pivot pin 6 are inclinedportions 9 to engage correspondingly inclined notches 7L adjacent to andmerging into the aperture Y and having flat sides as has also theaperture Y to-engage the flat surfaces 6 and f of the pin Z) forpreventing rotation of the pivot pin relatively to the rod Q. inclinedwith respect to the longitudinal axis of the feed rod Q so that the flatsurfaces 0 and f will therefore also assume an inclined The notches hare anchor j in the form of a hook having a pointer 7c adapted to bedriven into the plank U. The opposite end of the anchor extends into theslot V and is provided with an aperture 0 for the reception of the pivotpin 7). The aperture 0 is shown as being of cylindrical form and a slot7) is formed in the anchor j adjacent the aperture 0 into which it opensat one side. Preferably the slot p is only of slightly greater widththan the spacing of the flat surfaces 6 and f of the pivot pin 6.

In the form of the anchor j illustrated, said anchor has convergingportions 9 and 1", the aperture 0 and the slot p being formed in theportion g. At the outer end of the portion 7 is a downwardly projectingportion or hook s which carries the pointed end 70. The portion 1 ispreferably so arranged with respect to the portions Q and s that whenthe anchor y is in substantially the operative position, said portion 1"will assume a position approaching the horizontal and it is against thisportion that hammer blows may be struck for driving the end into theplank U.

In practice, when drilling rock of substantially uniform hardness, theanchor will oc cupy the position shown in Figures 1 and 2, that is, thepointed end 70 will be in engagement with the abutment, such as theplank U. When the anchor is thus positioned the rock drill will beadequately held against any form of rotary movement and it will beunnecessaryfor the operator to hold it against rotation. He maytherefore give his entire attention to the controlling devices, such asdrills of this type are provided with for controlling the percussive andfeeding elements. .When'the, drill steel tends to stick in the drillhole the pressure fluid supply to the percussive element may be cut offand the anchor may be rocked to the position illustrated in Figure 4:and moved endwise so that the slot 7) will engage the flat surfaces (2and f of the pivot pin. In this way the anchor j will be retained in thereleased position.

1 "With the anchor 7' in the released position, the operator may thengrasp the handle K and after the percussive element is again set inoperation may oscillate the entire drilling mechanism by hand, thusassuring a cylindrical hole in the soft material. After the drill steelG again encounters material in which the rotation mechanism will sufficeto assure a cylindrical hole,,the anchor may again be driven into theplank U and normal drilling may then be resumed.

In the modificationillustrated in Figures 5 and 6 a pairof members ifand u are disposed on opposite sides of the feed rod Q, and. are clampedtogether by pivot pins I) extend ing through lugs 41 and w on oppositeends of the members 25 and a respectively. The lugs '4; and w are sospaced with respect to each other as to form slots 00 therebetween forthe reception of anchors j, two being shown in this modification.Preferably the feed rod Q is slightly reduced as at 3 to form shoulders2 which will engage the sides of the members t and u to assure thecorrect posi- 5 tion of said members on the feed rod. The

pivot pin 5 and the anchors j may be in all respects like those shown inthe preferred modification so thatwhenever it is desired to rotate therock drill by hand the. anchors j may be readily moved into and held inthe released position by the pivot pins 7).

I claim: 1. In a rock drill, the combination of a percussive element anda feeding element, said feeding element comprising a cylinder and apiston, a polygonal bore in the cylinder, a rod on the piston slidablein the bore and in engagement therewith to prevent rotation of thepiston with respect to the cylinder, a slot in the feed rod, a pivotafl'ixed to the feed rod and extending transversely through the feed rodand the slot and having a flat surface, and an anchor rotatable aboutthe pivot and adapted to engagean abutment for pre- 7 venting rotationof the rock drill, said anchor being adapted to interlock with the pivotfor holding the anchor in the released position.

2. In a rock drill, the combination of a 30 percussive element and afeeding element, said feeding element comprising a cylinder and apiston, a polygonal bore in the cylinder, a rod on the piston slidablein the bore and in engagement therewith to prevent rotation of thepiston with respect to the cylinder, a slot in the feed rod, a fixedpivot extending transversely through the feed rod and the slot andhaving opposed flat'surfaces, an anchor having an aperture through whichthe pivot w extends and to enable said anchor to be oscillated about thepivot, said anchor having a pointer for engagement with an abutment forpreventing rotation of the rock drill, and a slot merging into theaperture to engage the flat surfaces for retaining the anchor in areleased position.- I

In testimony whereof I have signed this specification. V

VGEORGE W. HULSHIZER.

